Table 5.

Change in serum creatinine concentration from the baseline in hospitalised patients with and without CKD where ICD-10 code N17× did and did not indicate AKI (referred to as code positive and code negative)*

	Patients with CKD			Patients without CKD
		Absolute change (µmol/l)	Relative change (%)†		Absolute change (µmol/l)	Relative change (%)†
Code	N	Median (IQR)		N	Median(IQR)
+	308	108 (48 to 215)	53 (20 to 104)	1715	95 (43 to 197)	72 (29 to 161)
−	1324	16 (−8 to 51)	9 (−4 to 26)	35 219	6 (−4 to 19)	6 (−5 to 22)

Code positive and code negative patients were significantly different (all p-values <0.001).

Relative changes in patients with and without CKD were statistically different (p<0.0001).

*The ICD-10 N17× coding algorithm considered is all diagnoses.

†((peak serum creatinine—baseline serum creatinine)/baseline serum creatinine)).

To convert serum creatinine from μmol/l to mg/dl divide by 88.4.

CKD, chronic kidney disease; ICD-10, International Classification of Diseases, tenth revision; N, number; +, code positive; −, code negative; n/a, not applicable.